I shot a 10-round group at 25 yards/sand bagged rest with my SA 10mm yesterday using a medium load of CFE pistol and WOW!! 155 grain XTP and CCI LP primer.

The Springfield has a new HEX dragonfly R.D. on it, and you could have covered 6 or 7 of those rounds with a 50-cent piece. The entire 10 shots was about 2.5 inches outside diameter with one flyer a bit high and left or it would have been excellent - for me.

This is going to be my 10mm powder. It's not too pricey and it's available.